کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10280915 465845 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Breakage of TiO2 agglomerates in electrostatically stabilized aqueous dispersions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Breakage of TiO2 agglomerates in electrostatically stabilized aqueous dispersions
چکیده انگلیسی
Nanoparticles of metal oxides have applications as additives in thin nanocomposite films. For optical applications that include transparent films and coatings, nanoparticles should be uniformly dispersed in the polymer film. Most commercially available nanoparticles are large agglomerates about 1 μm in maximum dimensions composed of primary particles with sizes ranging from 5 to 50 nm. The large agglomerates scatter light and are not directly suitable for optical systems. Ultrasonication of liquid suspensions was used to prepare stable dispersions from commercial titania nanopowders. The mean diameter of sonicated titania nanopowders was correlated inversely to the specific energy. After a rapid initial size reduction, continued ultrasonication lead to insignificant reduction and even reagglomeration of the particles. Both erosion and fracture mechanisms were observed. None of the commercial nanopowders were successfully broken to their primary particle sizes. Reagglomeration of the dispersion could be prevented by electrostatic stabilization with nitric acid or ammonium hydroxide when its zeta potential value was less than − 30 mV or greater than + 30 mV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Powder Technology - Volume 160, Issue 2, 6 December 2005, Pages 121-126
نویسندگان
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